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2 marksFood Chains, Food Webs, and Decomposers

CSEC Biology · January 2006 · Paper 2 · Question 1(a)(ii)

The 'Green Minds' school gardening club investigates how temperature affects the decay rate of green leaves. Nine groups study decay at different temperatures over two weeks. The results are compiled in Table 1.

Identify TWO precautions each group should take in setting up their investigations.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 1(a)(i)Use the data in Table 1 to construct a graph showing the percentage decay of fresh green leaves at the temperatures investigated.[4 marks]
  2. 1(b)(i)Suggest ONE conclusion that may be drawn from the information presented in Table 1 and your graph.[2 marks]
  3. 1(b)(ii)Give ONE explanation for the conclusion arrived at in (b)(i) above.[2 marks]
  4. 1(b)(iii)One club member suggested that at a temperature of 80°C no decay would have occurred. Do you support this view? Explain your answer.[2 marks]
  5. 1(c)One of the goals of Green Minds is to promote the use of natural fertilizers by gardeners in the school's neighbourhood. Identify FOUR points about fertilisers…[4 marks]
  6. 1(d)(i)Describe how you would prepare the materials and apparatus for investigation illustrated in Figures 1.1 and 1.2.[3 marks]
  7. 1(d)(ii)Suggest ONE limitation to the method you described in d (i).[1 mark]
  8. 1(d)(iii)How far did the bubble move in 20 minutes?[1 mark]
  9. 1(d)(iv)Estimate the transpiration rate of the plant in the investigation.[2 marks]
  10. 1(d)(v)Suggest ONE reason why your estimated rate is not necessarily accurate.[2 marks]
  11. 1(d)(vi)Identify ONE external factor that might affect the movement of the bubble.[1 mark]
  12. 1(e)(i)Describe how the club members could determine the presence of TWO named nutrients in the yam-bean fruit.[2 marks]
  13. 1(e)(ii)State the expected food test results if the nutrients you chose in (e) (i) are present in the fruit.[2 marks]

More practice: the rest of this paper · more Food Chains, Food Webs, and Decomposers questions · all CSEC Biology past papers